today = 'Tuesday'

if today == 'Saturday' or today == 'Sunday':
    print("Let's go to the beach.")
else:
    print('No beach. Big :-(')
print('This is the end of the program.')

score = 19
MAX_SCORE = 20
LOWER_A = 15
LOWER_B = 10
LOWER_C = 5
MIN_SCORE = 0

if score >= LOWER_A:
    grade = 'A'

if score >= LOWER_B and score < LOWER_A:
    grade = 'B'

if score >= LOWER_C and score < LOWER_B:
    grade = 'C'

if score >= MIN_SCORE and score < LOWER_C:
    grade = 'D'

print(f'{score} is grade {grade}')
